// ============================================================================
//
// Copyright (C) 2006-2007 Dengues
//
// Google Group: http://groups.google.com/group/dengues
// QQ Group: 24885404
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
// ============================================================================
package org.dengues.designer.ui.database.commands;

import java.util.List;

import org.dengues.designer.ui.editors.AbstractGEFCommand;
import org.dengues.model.database.DBColumn;
import org.dengues.model.database.DBTable;
import org.dengues.model.database.DatabaseDiagram;
import org.dengues.model.database.ForeignKey;

/**
 * Qiang.Zhang.Adolf@gmail.com class global comment. Detailled comment <br/>
 * 
 * $Id: Dengues.epf 1 2006-09-29 17:06:40Z qiang.zhang $
 * 
 */
public class DBTableDeleteCommand extends AbstractGEFCommand {

    private final List<DBTable> tables;

    private final DatabaseDiagram diagram;

    /**
     * Qiang.Zhang.Adolf@gmail.com DBTableDeleteCommand constructor comment.
     * 
     * @param tables
     * @param diagram
     */
    public DBTableDeleteCommand(List<DBTable> tables, DatabaseDiagram diagram) {
        this.tables = tables;
        this.diagram = diagram;
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.eclipse.gef.commands.Command#execute()
     */

    @Override
    public void execute() {
        for (DBTable table : tables) {
            diagram.getDbChildren().remove(table);
            List<DBColumn> columns = table.getColumns();
            for (DBColumn col : columns) {
                List<ForeignKey> inputs = col.getInputs();
                List<ForeignKey> outputs = col.getOutputs();
                for (ForeignKey fk : inputs) {
                    DBColumn source = fk.getSource();
                    source.getOutputs().remove(fk);
                }
                for (ForeignKey fk : outputs) {
                    DBColumn target = fk.getTarget();
                    target.getInputs().remove(fk);
                }
            }
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.eclipse.gef.commands.Command#undo()
     */
    @Override
    public void undo() {
        for (DBTable table : tables) {
            diagram.getDbChildren().add(table);
        }
    }

}
